Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

²éѯ´æ´¢¹ý³ÌµÄ²ÎÊýÐÅÏ¢µÄSQLÓï¾ä

declare @SchemaName nvarchar(50)
set @SchemaName='dbo'
declare @CommandName nvarchar(50)
set @CommandName='spName'
SELECT
                DB_NAME() AS [PROCEDURE_CATALOG],
                @SchemaName AS [PROCEDURE_SCHEMA],
                NULL AS [PROCEDURE_NAME],
                '@RETURN_VALUE' AS [PARAMETER_NAME],
                0 AS [ORDINAL_POSITION],
                CAST(4 AS smallint) AS [PARAMETER_TYPE],
                0 AS [PARAMETER_HASDEFAULT],
                NULL AS [PARAMETER_DEFAULT],
                CAST(0 AS bit) AS [IS_NULLABLE],
                0 AS [DATA_TYPE],
                NULL AS [CHARACTER_MAXIMUM_LENGTH],
                NULL AS [CHARACTER_OCTET_LENGTH],
                CAST(10 AS smallint) AS [NUMERIC_PRECISION],
                CAST(NULL AS smallint) AS [NUMERIC_SCALE],
                NULL AS [DESCRIPTION],
 


Ïà¹ØÎĵµ£º

sql²»³£¼ûÓï¾ä»ã×Ü

1¡¢join
A±íµÄÖ÷¼üÊÇ×÷ΪB±íµÄÍâ¼ü¡£ÔÚ²éѯµÄʱºò£¬¿ÉÒÔͨ¹ý²»Í¬µÄjoin½«AºÍB±íÁ´½ÓÆðÀ´£¬´Ó¶øµÃµ½²»Í¬µÄ²éѯ½á¹û¡£
* JOIN: Èç¹û±íÖÐÓÐÖÁÉÙÒ»¸öÆ¥Å䣬Ôò·µ»ØÐÐ
* INNER JOIN: Èç¹ûÁ½¸ö±íÖÐÓÐÆ¥ÅäµÄ£¬Ôò·µ»ØÐР         
* LEFT JOIN: ¼´Ê¹ÓÒ±íÖÐûÓÐÆ¥Å䣬Ҳ´Ó×ó± ......

ÓÃASP.NET»¹Ô­Óë»Ö¸´Sql server

ÉÏ´Î×öÁ˸öÏîÄ¿£¬Éæ¼°µ½Êý¾Ý¿âµÄ»¹Ô­ºÍ»Ö¸´£¬µ½ÍøÉÏÕÒÁËһϣ¬ÊÇÀûÓÃSQLDMOʵÏֵģ¬Ö»ÒªÌí¼ÓSQLDMOÒýÓþͺÃÁË£¬È»ºóÀûÓÃϱߵÄÀàµÄ·½·¨¾Í¿ÉÒÔʵÏÖÁË¡£
¡¡¡¡ÎÒ°ÑÔ­×÷ÕßµÄÀàÀ©³äÁËһϣ¬¿ÉÒÔ×Ô¶¯Ê¶±ðweb.configÀï µÄÊý¾Ý¿âÁ¬½Ó×Ö·û´®£¬¿ÉÒÔͨ¹ý±äÁ¿ÉèÖû¹Ô­»Ö¸´µÄÐÅÏ¢¡£
¡¡¡¡ÐèҪעÒâµÄʱ»¹Ô­£¬»¹Ô­µÄʱºòÎÊÌâ×î´óÁË£¬Óбð ......

SQL »ù±¾²Ù×÷ ɾ³ý ÐÞ¸Ä Ë¢ÐÂ

SQL³£ÓÃÃüÁîʹÓ÷½·¨£º    
   
  (1)   Êý¾Ý¼Ç¼ɸѡ£º    
   
  sql="select   *   from   Êý¾Ý±í   where   ×Ö¶ÎÃû=×Ö¶ÎÖµ   order   by   ×Ö¶ÎÃû   [desc]"    
   
  sq ......

SQL ³£ÓÃÓï¾ä

Student(S#,Sname,Sage,Ssex) ѧÉú±í
Course(C#,Cname,T#) ¿Î³Ì±í
SC(S#,C#,score) ³É¼¨±í
Teacher(T#,Tname) ½Ìʦ±í
 
ÎÊÌ⣺
1¡¢²éѯ“001”¿Î³Ì±È“002”¿Î³Ì³É¼¨¸ßµÄËùÓÐѧÉúµÄѧºÅ£»
  select a.S# from (select s#,score from SC where C#='001') a,(select s#,score
& ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ